Single crystal growth of CeTAl3 (T = Cu, Ag, Au, Pd and Pt)

Senyshyn, Anatoliy; Regnat, Alexander; Duvinage, C.; Schönmann, Rudolf; Bauer, Andreas; Prots, Yurii; Akselrud, Lev; Hlukhyy, Viktor; Baran, Volodymyr; Pfleiderer, C.

doi:10.1016/j.jallcom.2016.07.071

Cited by 25 publications

(61 citation statements)

References 42 publications

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“…Treating the contribution of the Bravais lattice, HnormalL, in a harmonic approximation we calculated the structural properties and spectrum of phonon excitations (60) using the Vienna ab initio simulation package (VASP) in the frozen-core projector augmented wave (PAW) method. The calculated lattice constants a=4.335 Å and c=10.844 Å were found to be in excellent agreement with experiment (52). Further, the spectrum of phonon excitations was calculated using a finite-difference method.…”

Section: Discussionsupporting

confidence: 79%

“…High-quality single-crystal normalCnormalenormalAnormalunormalAnormall3 was grown by optical float zoning under ultrahigh vacuum-compatible conditions (67). High sample purity was confirmed by means of resistivity, magnetization, and specific heat of small pieces cut from the same ingot (52, 68). The correct normalBnormalanormalNnormalinormalSnormaln3-type structure and high crystalline quality were confirmed by powder and Laue X-ray diffraction as well as neutron diffraction (52).…”

Section: Methodsmentioning

confidence: 99%

“…High sample purity was confirmed by means of resistivity, magnetization, and specific heat of small pieces cut from the same ingot (52, 68). The correct normalBnormalanormalNnormalinormalSnormaln3-type structure and high crystalline quality were confirmed by powder and Laue X-ray diffraction as well as neutron diffraction (52). Neutron diffraction established that antisite disorder is negligible in the present samples (52), consistent with a recent NMR study (69).…”

Section: Methodsmentioning

confidence: 99%

“…In this paper we report a comprehensive single-crystal inelastic neutron scattering study of the low-lying excitations and ab initio phonon calculations in the paramagnetic state of normalCnormalenormalAnormalunormalAnormall3 (Fig. 1 A ), a member of the normalCnormalenormalTnormalAnormall3 series (T = Ce, Au, Pd, Pt) and thus the wider family of normalBnormalanormalAnormall4-type materials (52). Early measurements of the bulk and transport properties of polycrystalline samples established normalCnormalenormalAnormalunormalAnormall3 as a Kondo lattice compound stabilizing incommensurate antiferromagnetic order below TnormalN=1.32 K (50, 54).…”

mentioning

confidence: 99%

“…The tetragonal normalBnormalanormalNnormalinormalSnormaln3 structure (space group I4mm, no. 107) lacks inversion symmetry (50–52). ( B ) Brillouin zone of a body-centered tetragonal lattice (where c>a).…”

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confidence: 99%

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Magnetoelastic hybrid excitations in CeAuAl ₃

Čermák

Schneidewind

Liu

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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Nearly a century of research has established the Born–Oppenheimer approximation as a cornerstone of condensed-matter systems, stating that the motion of the atomic nuclei and electrons may be treated separately. Interactions beyond the Born–Oppenheimer approximation are at the heart of magneto-elastic functionalities and instabilities. We report comprehensive neutron spectroscopy and ab initio phonon calculations of the coupling between phonons, CEF-split localized 4f electron states, and conduction electrons in the paramagnetic regime ofCeAuAl3, an archetypal Kondo lattice compound. We identify two distinct magneto-elastic hybrid excitations that form even though all coupling constants are small. First, we find a CEF–phonon bound state reminiscent of the vibronic bound state (VBS) observed in other materials. However, in contrast to an abundance of optical phonons, so far believed to be essential for a VBS, the VBS inCeAuAl3arises from a comparatively low density of states of acoustic phonons. Second, we find a pronounced anticrossing of the CEF excitations with acoustic phonons at zero magnetic field not observed before. Remarkably, both magneto-elastic excitations are well developed despite considerable damping of the CEFs that arises dominantly by the conduction electrons. Taking together the weak coupling with the simultaneous existence of a distinct VBS and anticrossing in the same material in the presence of damping suggests strongly that similarly well-developed magneto-elastic hybrid excitations must be abundant in a wide range of materials. In turn, our study of the excitation spectra ofCeAuAl3identifies a tractable point of reference in the search for magneto-elastic functionalities and instabilities.

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Section: Discussionsupporting

confidence: 79%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Magnetoelastic hybrid excitations in CeAuAl ₃

Čermák

Schneidewind

Liu

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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ChemInform Abstract: Single Crystal Growth of CeTAl₃ (T: Cu, Ag, Au, Pd and Pt).

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2016

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High‐Pressure Studies of Correlated Electron Systems

Jorba

Regnat

Tong

et al. 2022

Physica Status Solidi (b)

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Tuning the electronic properties of transition‐metal and rare‐earth compounds by virtue of changes of the crystallographic lattice constants offers controlled access to new forms of order. The development of tungsten carbide (WC) and moissanite Bridgman cells conceived for studies of the electrical resistivity up to 10 GPa, as well as bespoke diamond anvil cells (DACs) developed for neutron depolarization studies up to 20 GPa is reviewed. For the DACs, the applied pressure changes as a function of temperature in quantitative agreement with the thermal expansion of the pressure cell. A setup is described that is based on focusing neutron guides for measurements of the depolarization of a neutron beam by samples in a DAC. The technical progress is illustrated in terms of three examples. Measurements of the resistivity and neutron depolarization provide evidence of ferromagnetic order in SrRuO3 up to 14 GPa close to a putative quantum phase transition. Combining hydrostatic, uniaxial, and quasi‐hydrostatic pressure, the emergence of incipient superconductivity in CrB2 is observed. The temperature dependence of the electrical resistivity in CeCuAl3 is consistent with emergent Kondo correlations and an enhanced coupling of magneto‐elastic excitations with the conduction electrons at low and intermediate temperatures, respectively.

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Single crystal growth of CeTAl3 (T = Cu, Ag, Au, Pd and Pt)

Cited by 25 publications

References 42 publications

Magnetoelastic hybrid excitations in CeAuAl ₃

Magnetoelastic hybrid excitations in CeAuAl ₃

ChemInform Abstract: Single Crystal Growth of CeTAl₃ (T: Cu, Ag, Au, Pd and Pt).

High‐Pressure Studies of Correlated Electron Systems

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Single crystal growth of CeTAl3 (T = Cu, Ag, Au, Pd and Pt)

Cited by 25 publications

References 42 publications

Magnetoelastic hybrid excitations in CeAuAl 3

Magnetoelastic hybrid excitations in CeAuAl 3

ChemInform Abstract: Single Crystal Growth of CeTAl3 (T: Cu, Ag, Au, Pd and Pt).

High‐Pressure Studies of Correlated Electron Systems

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Product

Resources

About

Magnetoelastic hybrid excitations in CeAuAl ₃

Magnetoelastic hybrid excitations in CeAuAl ₃

ChemInform Abstract: Single Crystal Growth of CeTAl₃ (T: Cu, Ag, Au, Pd and Pt).